This was taken after the first night of a four-day-hike along the border between Austria and Italy. The mountain in the back is called Feuerstein (firestone), probably because of his vibrant red color. I got up just before sunrise and happily discovered that the air was perfectly calm and clear. The water in the foreground is not much more than a 3-4m wide puddle, but the reflection was perfect. Not even a polarizer was used.
Edited in Lightroom with minimal global adjustments.
Taken on my travel & adventure camera Sony RX10 M4 at 8.8mm f/8.0 1/30s ISO250 (should be 24mm f/22 full frame equiv)